Telephone testing circuit



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v TELEPHONE TESTING CIRCUIT 4 Filed Aug. 9, 1939 43 Sheets-Sheet 3 IN1/EN TOR J. W. DE HN By @am l A 770MB/ J. w. DEHN TELEPHONE TESTING IRCUIT- 45 Sheets-Sheet 4 Filed Aug. 9, 1939 /NvEA/ro@ By ./.W DEH/v ATTORNEY 45 Sheets-Sheet 5 T I w m m Bu. "n, N 0.1 G l m m 9 T n. ua w T A E .d ...m n Y H .l |l| m F L nOmN RGN mNQN @NGN wem.

Dec. 24, A1940.

/NVEN TOR By J. W DEHN Y v A 7' TORNEV J. W. DEHN TELEPHONE TESTING CIRCUIT Filed Aug. 9, 1939 43 sheds-sheet e /NvE/vTo/e J. W. DE HN ,AHORA/Er J. w. DEHN TELEPHONE TESTING CIRCUIT Dec. 24, 1940.

Filed Aug. 9, 1939 43 Sheets-Sheet 7 m2 k .um

/N VE N TOR y JmpfH/v M A T TORNEI Dec. 24, 1940. J. w. DEHN 2,225,688

TELEPHON TESTING CIRCUIT Filed Aug. 9, 1939 43 Sheets-Sheet- 8 /Nl/E/v Ton J. W. DE HN A T TORNEY 24, 1940. w, DHN 2,225,688

y TELEPHONE TESTING CIRCUIT Filed Aug, 9, 19:59 45`sheets-sneet 9A A l l /NVEN Ton J. W. DEHN BY- @6.9mm

. 24, 1940. J. w. DEHN TELEPHONE TESTING CIRCUIT Filed Aug. 9. 1939 43 Sheets-Sheet 10 righ HEL O Ok /NVENTOR J. W. DE HN A r ToRNL-Y Filed Aug. 9, 1939 45 Sheets-Sheet ll /N VEN TOR A 7' Tom/Ey 24, 1940. J. w. DEI-IN TELEPHONE TESTING CIRCUIT #sheets-sheet 12 Filed Aug. 9, 1939y /N VEN Ton By J. PV. DE HN m' A 7 Tom/Ey Filed Aug. 9, 1939 43 Sheets-Sheet l5 NQS . mmm" /Nl/ENTOR By vJWDEf-/N ATTORNEY 24, 1940. J. w. DEHN y TELEPHONE TESTING CIRCUIT Filed Aug. 9, 1959 43 sheets-sheet 14 /NVENTOR By J. W. DEHN Q 6.

A T TORNEY Dx'- 24, 11940 J. w. DEHN v I TELEPHQNE TESTNG CIRCUIT Filed Aug. 9, 1939 45 Sheets-Sheet 15 /NVENTOR -By J. n. DEHN A T TORNEV 24, 1940. J. w. DEI-1N TELEPHONE TESTING CIRCUIT Filed Aug. 9, 1959 43 Sheets-Sheet 16 s GPM.

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,4 Tram/5y Jl W. DEHN TELEPHONE TESTING CIRCUIT Filed Aug. 9, i959 43 Sheets-Sheet 17 .weht ..25 Qa.

/N VEN TOR By J. W. DEH/v @a @9mm A r ron/sgr J. W. DEHN TELEPHONE TESTING CIRCUIT Filed Aug. 9, 1939 43 Sheets-Sheet 18 von N /NVENTOR y J. n'. DEH/v ATTORNEY Dec. 24, 1940. J, w, DEHN TELEPHONE TESTING CIRCUIT 43 sheets-sheet 19 yFiled Aug.- 9, 1939 WSN www@ IVMI AGN www /N VEN TOR QS l T J. W DEH/V @am A T'TORNEV Dec. 24, 1940.

J. w. DEHN TELEPHONE TESTING CIRCUIT Filed Aug. 9, 1959 43 Sheets-Sheet '2O /N VEN TOR By J. W. DEH/V 

